论文标题
从室温DE调节KC $ _8 $获得的无序石墨中可能的高温超导过渡
Possible high temperature superconducting transitions in disordered graphite obtained from room temperature deintercalated KC$_8$
论文作者
论文摘要
尽管扭曲的石墨烯纳米驱动器的进展正在提高其Moiré平面电子带的结果,但对未来发展的巨大选择是其优化的障碍。我们在这里报告说,kc $ _8 $的软化学解释会破坏石墨堆叠产生强大的疾病,其中包括堆叠曲折和可变的本地掺杂。我们获得了一个散装石墨,其各个微晶具有不同的堆叠,并具有任意的曲折和掺杂,在同一样品中扫描大量的堆叠配置。我们对具有不同合成条件的批次进行磁化测量。该疾病削弱了石墨的巨大电磁作用,揭示了几种相变。 Curie温度t $ _0 $$ \ sim $ 450k出现“铁磁样”磁化,必须从测量的磁化化中减去。根据样品合成,对Diamagnetic态的异常出现在T $ _C $ \ SIM \ SIM $ 110K(3个样本),$ \ sim $ 240K(4个样本),$ \ sim $ 320K(2个样本)。电阻率测量结果对于T $ _C \ SIM $ 240K过渡产生异常,其中一个样本显示90%的下降。我们讨论了这些(Dimamnetic and Dissitical)异常可能是由于超导性引起的。
Although progress with twisted graphene nano-devices is boosting the superconductivity that is the consequence of their Moiré flat electronic bands, the immense choice for future development is an obstacle for their optimisation. We report here that soft-chemistry deintercalation of KC$_8$ breaks down graphite stacking generating a strong disorder that includes stacking twists and variable local doping. We obtain a bulk graphite whose individual crystallites have different stackings with arbitrary twists and doping, scanning in the same sample a huge number of stacking configurations. We perform magnetisation measurements on batches with different synthesis conditions. The disorder weakens the huge diamagnetism of graphite, revealing several phase transitions. A "ferromagnetic-like" magnetisation appears with Curie temperatures T$_0$$\sim$450K, that has to be subtracted from the measured magnetisation. Depending on sample synthesis, anomalies towards diamagnetic states appear at T$_c$$\sim$110K (3 samples), $\sim$240K (4 samples), $\sim$320K (2 samples). Electrical resistivity measurements yield anomalies for the T$_c\sim$240K transition, with one sample showing a 90% drop. We discuss the possibility that these (diamagnetic and resistitive) anomalies could be due to superconductivity.